utils/image/manifest has an additional `arch` parameter, which determines
whether an image ends in `-$ARCH` (like `-amd64`).
All locations that previously had gcr.io urls referenced in costants or inline
have been updated to refere test/utils/image.
Automatic merge from submit-queue (batch tested with PRs 56108, 56811, 57335, 57331, 54530). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Fix Stackdriver Logging e2e tests
This PR fixes the problems in the SD Logging tests:
- Because of Docker problem, trimming works unpredictably on some OSs, so instead of assuming exact trimming mechanism, just assume trimming
- Increases the throughput of reading logs through Pub/Sub by increasing the parallelism level
```release-note
NONE
```
